| Research on temporal and spatial distribution characteristics of soil nutrient and salt under different reclamation years |
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| DOI：10.7606/j.issn.1000-7601.2016.03.02 |
| Key Words: cultivation year soil nutrients soil salinity temporal and spatial variation |
| Author Name | Affiliation | | GU Hai-bin | Xinjiang Key Laboratory of Soil and Plant Ecological Processes, College of Grassland and Environmental Sciences, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | WANG Ze | Xinjiang Key Laboratory of Soil and Plant Ecological Processes, College of Grassland and Environmental Sciences, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | Wu Hong-qi | Xinjiang Key Laboratory of Soil and Plant Ecological Processes, College of Grassland and Environmental Sciences, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | SHENG Jian-dong | Xinjiang Key Laboratory of Soil and Plant Ecological Processes, College of Grassland and Environmental Sciences, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China |
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| Abstract: |
| The objective of this study was to explore the temporal and spatial variation rules of soil nutrients and salt under different cultivation years of agriculture in the arid areas. Uncultivated land and lands with 2, 4, 6, 8 years of cultivation in the Manas River Valley as the research object. Using methods of geostatistics, 3S technology and temporal-spatial conversion, the time and space distribution characteristics of soil nutrient and salt were analyzed. The results showed that the contents of total soil salt and available potassium at each layer had an obvious downward trend with the increase of cultivation years. The soil salts from 11.9～25.2 g·kg-1 in barren land fell to 1.7～3.0 g·kg-1 after 8 years cultivation. The contents of surface soil salt maintained at low levels until reclaimed 6～8 years in the study area. It also showed that the contents of soil available potassium presented a continuous consumption trend. The soil available potassium from 225～499 mg·kg-1 of barren land fell to 138～225 mg·kg-1 after 8 years cultivation. The contents of soil organic matter, alkali-hydro nitrogen and available phosphorus became firstly decreased, and then went increased with reclaimed years increased. The trough of soil nutrients appeared in about 4 years of land reclamation. For example, the soil available phosphorus from 3.7～8.1 mg·kg-1 in barren land fell to 1.9～5.7 mg·kg-1 after 4 years cultivation, and then rose to 3.37～13.5 mg·kg-1 after 8 years cultivation. In conclusion, our studies have shown that length of reclaimed time in research area influences soil nutrients and salt contents and displays a certain degree of regularity. |
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